Sewing-machine.



No. 892,643. PATENTED JULY 7,1908.

R. BROWN.

VSEWING MACHINE.

APPLIoATIoN FILED FEB. 4. 1901.

2 SHEETS-SHEET 2.

INVENTOR.

UNITED STATES PATENT OFFICE.

ROBERT BROWN, OF BELFAST, IRELAND.

SEWING-MACHINE.

Application filed February 4, 1907.

To all whom it may concern:

Be it known that I, ROBERT BROWN, British subject, and resident ofBelfast, Ireland, have invented certain new and useful Improvements inSewing-Machines, of which the following is a specification.

This invention relates to sewing machines of the type in which fancystitch and embroidery work is done by means of an oscillating needle baroperated by a quadrant lever and cam.

The invention is designed to provide a reciprocating movement to theshuttle synchronously with the movement of the needle bar and needle tomaintain the relative positions of the needle and shuttle constant andimprovements in the constructions of the needle oscillating mechanismwhereby the' same, is connected with the shuttle to give the desiredmovement to the latter.

It consists essentially of an oscillating lever worked by a cam on themain shaft connected with the shuttle shaft which is divided into twolengths with a suitable coupling to allow the shuttle bracket andshuttle to be moved forward and backward simultaneously with the needlebar, and a connection therefrom to connect with the needle bar to givethe desired oscillating movement thereto.

The invention will be fully described with reference to the accompanyingdrawings forming part of the specification.

Figure 1. is a side elevation of the sewing machine partly in section(from the back). Fig. 2. is a plan of same. Fig. 3. is a sectional lanon line 'y-fy Fig. 1. below the base p ate 2. Fig. 4. is a transversesectional elevation on line -x Fig. 1.

The main parts of the sewing machine such as the head 1, the base plate2, the driving shaft 3, the needle bar 4, the needle bar crank 5, theneedle bar frame 6, the counter driving shaft 7, the feed bar 8 and thefeed shafts 9 are all of the ordinary construction and will require nofurther description. The presser and presser foot are of ordinaryconstruction and are not shown on the drawin 's.

The osci lating lever A, by which the desired oscillating movement isimparted to the needle bar 4, I construct of bell crank L or T formpivoted at a and the free member a of the lever is employed to transmitthe necessary movement. The lever A is oscillated by a cam A on thedriving shaft 3 in the Specification of Letters Patent.

Patented July '7, 1908.

Serial No. 355,637.

usual way. On the member a of the lever A a traversing cradle orcarriage B is mounted which can be moved to or 'from the center ofoscillation a to shorten or lengthen the throw of the needle bar.

The carriage or cradle B is moved along the arm of the lever A by alever O which is connected by a link with a treadle or other means formoving it up and down.

To give a reciprocating movement to the shuttle carrier D and to theshuttle carried therein corresponding with the oscillation of theneedle' barthe shuttle shaft is divided into two lengths d d with acoupling E between them which permits of the part d being reciprocatedlongitudinally as it rotates with the part d. The coupling comprises twoplates c e affixed to the shafts d d respectively provided with pins e2projecting from the face of one and pins c3 projecting from the face ofthe other, and each with holes or notches through which the pins on theother project. On the shaft d a sleeve and bracket d3 is fitted behindthe shuttle bracket or carrier D and the two are connected together or Afixed together.

The sliding carriage or cradle B is connected with the shuttle carrier Dand the bracket d by the connecting rod F F and the bell crank lever F2on the rocking shaft f so that the movement of the oscillating lever Ais thereby transmitted to the shuttle shaft d and the shuttle carrier D.

' The shuttle carrier D and bracket d3 are also connected to an uprightrocking shaft G by a link or connecting rod G and an arm g whereby theshaft G is rocked as the shuttle carrier D is reciprocated. The rockingmovement of the shaft G is transmitted to the needle bar 4 by the arm Hthereon and the link or connecting rod h so that the movement of thelever A is thus simultaneously transmitted to the shuttle carrier andneedle bar which thereby always retain the same relative positions.

A tension device K is fitted over the driving shaft with a pin 7cpassing through to a cam M on the driving shaft 3 by which the Aprovided With vertical and horizontal members, of a carriage B mountedupon the horizontal erm of the said lever, a bell crank lever F2 uponthe rocking shaftf, a connecting rod F to connect the Carriage With thebell crank lever F2, a connecting rod F to connect the said bell Cranklever With the shuttle carriene shuttle carrier D upona shuttle Shaft dcapable of longitudinal movement While rotating, a Coupling E, tooonneot the shuttle shaft d with the driving shaft d, a connecting rodG', arm g, rocking shaft Gyarm H thereon, and connecting rod 72, toconnect the shuttle carrier With the needle bar 4 and cause it tooscillate, simulteneously With the shuttle carrier substantially asdescribed.

In Witness whereof, I have hereunto signed my name in the presence oftWo subscribing Witnesses.

ROBERT BROWN. Witnesses:

JOHN QUINN, ROBERT MENORY.

